the last word

In the last post I showed MTF results from a simulation of a Bayer-CFA camera with a diffraction-limited lens. The camera had a 4.77 micrometer (um) pixel pitch. I had previously done an MTF analysis of the Zeiss Otus 55mm f/1.4 lens on a Sony alpha 7R, a camera with that pixel pitch. I thought… [Read More]

I’ve been working on camera and lens simulation for a couple of weeks, and I decided that I needed a technique for calculating the spatial frequency responses (SFRs) and modulation transfer functions (MTFs) of synthetic images that was a) completely open, so I could understand just what it was doing, and b) embeddable in my… [Read More]

There is a trend in the camera marketplace to offer cameras with no antialiasing (AA) filters. None of the medium format camera that I know of use such filters. Recent full frame and APS-C cameras from Leica, Sony and Nikon have also dispensed with AA filters. In the recent posts about Imaging System Q I… [Read More]

With a lens this good, the real question is. “At what f-stops is the lens diffraction-limited.?” I thought I’d try to find out. The motivation is to get some insight into how close real photographic lenses are to being diffraction-limited, and thus learn whether or not the concept of Imaging System Q, which I’ve been… [Read More]